A 4-year-old boy is brought to the clinic by his parents due to language delay. He speaks only a few single words, does not respond to his name consistently, and prefers playing alone. He often lines up his toys in a precise order and becomes distressed if the order is changed. Physical exam is normal. Which of the following is the most likely diagnosis?
✓ Correct Answer: Option C
The constellation of social communication deficits (language delay, not responding to name, preferring to play alone) and restricted, repetitive behaviors (lining up toys, distress with changes) is highly characteristic of Autism Spectrum Disorder.